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Tractor Pulling Discussion Forum

boring and stroking a C-281

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Mcred

12-27-2005 21:43:47




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I want to bore and stroke a C-281 and put it into what is left of the neighbors Super M-ta, and was woundering how far you can bore the block and still have sleeves and we also want to add a half inch stroke to the crank. What can I figure as a minimum price for this set up for parts and machining done only on the bottom end head will worry about later, good friend and I want to go in on it together and he is a mecanic so labor is not an issue just parts and machining

p.s. this Super M-TA is in skeliton form so we are not going to be cutting up a good tractor just want to have a little fun with the old girl !

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Farmall Doctor

12-31-2005 07:54:57




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 Re: boring and stroking a C-281 in reply to Mcred, 12-27-2005 21:43:47  
Just how are you guys stroking all these engines?? It seems like everybody on here is doing it, so it must be pretty easy... or you have lots of cash...? Are you getting the cranks built up and offset ground, or are you making the journal smaller? If so, where do you find the rod bearings to fit the rods and crank?? Someone said you can use stock rods, so where do you find these special pistons?? I have a W6, and an old 263 block with holes through the sleeves, so it would be a good block to experiment with. Could someone enlighten me? I would appreciate it.
Thanks,
FD

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Mcred

12-30-2005 13:13:49




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 Re: boring and stroking a C-281 in reply to Mcred, 12-27-2005 21:43:47  
thanks again, will see what we can do



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Flogger

12-29-2005 04:29:18




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 Re: boring and stroking a C-281 in reply to Mcred, 12-27-2005 21:43:47  
You should be able to bore a 281 block to 4.375 with no adverse affects if it's in good shape. I'd definitely go a little further on the stroke. 6.25-6.5 can be done about as easy as 5.75. You can use stock rods and piston selection is a little better with the longer stroke.



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Mcred

12-29-2005 11:26:31




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 Re: boring and stroking a C-281 in reply to Flogger, 12-29-2005 04:29:18  
hey Flogger thanks for the info and was woundering how many cubes you would get with the 6.5 stroke and what you would have to do to the block to make it fit.



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Flogger

12-29-2005 12:17:41




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 Re: boring and stroking a C-281 in reply to Mcred, 12-29-2005 11:26:31  
4.375 bore and 6.5 stroke would make 390 cubes. There will be some die grinding to be done to the block to get 6.5 to clear. The exhaust lobes on the cam will hit and a lot of guys are narrowing the big ends of the rods and the crank journals to make the clearancing a little easier. At 6.5 countersinking the rod bolts would probably be a good idea too. With 390 inches, a good head, cam, carb and ignition you should be over a 100 hp at stock rpm. It can be done on a reasonable budget too if you don't mind doing some of the grunt work yourself.

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